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1978 F250 build
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[QUOTE="markfuga, post: 1470779, member: 10964"] I was finishing laying the sound deadening on the floor and firewall when I realized it was somewhat a pointless exercise if I didn't also cover the heater/AC box. The box fits into a HUGE gaping hole in the firewall and is just (most hollow) plastic. All the floor covering I could add wouldn't help much because that box would just resonate all the engine noise into the cab. I first covered the box with the same sound deadening I used on the floor and then came over that with a fiberglass/mylar matting. This should significantly reduce noise and heat from entering the cab. [/QUOTE]
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